Shock wave structure in a lattice gas

The motion and structure of shock and expansion waves in a simple particle system, a lattice gas and cellular automaton, are determined in an exact computation. Shock wave solutions, also exact, of a continuum description, a model Boltzmann equation, are compared with the lattice results. The comparison demonstrates that, as proved by Caprino et al. [“A derivation of the Broadwell equation,” Commun. Math. Phys. 135, 443 (1991)] only when the lattice processes are stochastic is the model Boltzmann description accurate. In the strongest shock wave, the velocity distribution function is the bimodal function proposed by Mott-Smith

Structure and mixing of a transverse jet in incompressible flow

The flow field induced by a jet in incompressible cross-flow is analysed and the results compared with those obtained in a reacting water-jet experiment. It is argued that the axial vortex pair in the flow arises from the jet momentum normal to the free stream, the momentum flux being equivalent to a normal force, i.e. to a lift

The Coherent Flame Model for Turbulent Chemical Reactions

A description of the turbulent diffusion flame is proposed in which the flame structure is composed of a distribution of laminar diffusion flame elements, whose thickness is small in comparison with the large eddies. These elements retain their identity during the flame development; they are strained in their own plane by the gas motion, a process that not only extends their surface area, but also establishes the rate at which a flame element consumes the reactants. Where this flame stretching process has produced a high flame surface density, the flame area per unit volume, adjacent flame elements may consume the intervening reactant, thereby annihilating both flame segments. This is the flame shortening mechanism which, in balance with the flame stretching process, establishes the local level of the flame density. The consumption rate of reactant is then given simply by the product of the local flame density and the reactang consumption rate per unit area of flame surface. The proposed description permits a rather complete separation of the turbulent flow structure, on one hand, and the flame structure, on the other, and in this manner permits the treatment of reactions with complex chemistry with a minimum of added labor. The structure of the strained laminar diffusion flame may be determined by analysis, numerical computation, and by experiment without significant change to the model

The Fable of Fire

This creative writing thesis, The Fable of Fire features a fantastic journey depicting young people with exceptional abilities, who save their world from malevolent forces. The plot features para-normal elements, drawing on ancient mythologies including Celtic and Gaelic, coupled with some Christian symbolism. This novella is aimed at a young adult audience. The story transitions from the rescue of a loved one to the defence of their community. The Fable of Fire focuses on the conflict between good and evil and the importance of cooperation

BACIBeans: A NetBeans Plugin for Concurrent Programs

C-- is a programming language developed by M. Ben-Ari to teach principles of concurrent and distributed programming. It is a small subset of the C language but with the added features of concurrency, semaphores, and monitors. BACI is an acronym for Ben-Ari Concurrency Interpreter. JavaBACI is an open-source command line concurrency simulator used by students to compile and run C-- programs. NetBeans is an integrated development environment (IDE) that many students use in our courses to develop Java and C++ programs. This talk describes the development of a NetBeans plug-in we call BACIBeans that integrates JavaBACI into NetBeans, combining the familiarity and ease of use of NetBeans with the concurrency interpreter. The plugin allows students to write, compile, and run C-- programs within the familiar NetBeans IDE

The Copala Triqui auxiliary construction for emotional and psychological predicates

Copala Triqui has a construction in which predicates of emotion and psychological state appear with one of two special auxiliary verbs, derived historically from verbs meaning \u27see\u27 and \u27look\u27. This paper details the constraints on the syntax of the emotion auxiliary construction and contrasts it with the ordinary verbal syntax of the language. (Ethnologue code TRC

The development of statives in Colonial Valley Zapotec

This paper describes the semantics of the Colonial Valley Zapotec aspect prefix WA- (orthographic hua- ~oa-) and its diachronic development in modern Valley and Isthmus Zapotec